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1. Union Membership Nationwide 13.7% of employed wage and salary workers are union members (down from 20.1% in 1983). A random sample of 300 local wage and salary workers showed that 50 belonged to a union. At ?=0.05, is there sufficient evidence to conclude that the proportion of union membership differs from 13.7%?
2. Free School Lunches It has been reported that 59.3% of U.S. school lunches served are free and at a reduced price. A random sample of 300 children in a large metropolitan area indicated that 156 of them received lunch free or at a reduced price. At the 0.01 level of significance, is there sufficient evidence to conclude that the proportion is less then 59.3%?
3. Automobile Part Production In an effort to increase production of an automobile part, the factory manager decides to play music in the manufacturing area. Eight workers are selected, and the number of items each produced for a specific day is recorded. After on week of music, the same workers are monitored again. The data are given in the table. At ?=0.05 can the manager conclude that the music has increased production?
Worker 1 2 3 4 5 6 7 8
Before 6 8 10 9 5 12 9 7
After 10 12 9 12 8 13 8 10
Downs and Abwender (2002) found neurological deficits in soccer players who are routinely hit on the head with soccer balls compared to swimmers, who are also athletes but who are not regularly hit in the head. Is this an example of an experimenta..
In a clinical study of an allergy drug, 112 of the 210 subjects reported experiencing significant relief from their symptoms. At the 0.01 significance level,
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
Suppose the horses in a large stable have a mean weight of 1464 lbs, and a standard deviation of 111. What is the probability that the mean weight of the sample horses would differ from the population mean by less than 11 lbs if 34 horses are samp..
Mean = 14.2, s² = 5.92 and sum of X squared EX² = 2941.60. What can be concluded about age differences in problem solving ability?
A random sample of 225 fathers from Littleton, yielded 97 who did not help with child care. Using a .05 level of significance test the claim that the proportion is at least 34%.
What advantage does correlation have over a cross-tab?
To guarantee that cans of soda are properly filled, some cans are sampled and the amounts measured. The overall average for the samples is 12 ounces.
Using a spreadsheet, create a table that shows the relationship among the units of heights of people in centimeters, inches and feet in the range of 150cm to 2m. Use increments of 5cm.
Finding Normal probabilities using standard normal table or Excel built in functions
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
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